How were the Texans able to drive off the Mexican attack outside of San Antonio?

In early October 1835, Texas settlers gathered in Gonzales to stop Mexican troops from reclaiming a small cannon. The resulting skirmish, known as the Battle of Gonzales, launched the Texas Revolution. ... On October 13, Austin led his forces towards Béxar to confront the Mexican troops.

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begins a massive airlift of food, water, and medicine to the citizens of the besieged city

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.